are all h3's required to have 285 75 16 tires
That is the stock tire size but you can probably go one or two sizes bigger as long as all 4 are the same size.
265/75- 16 were an option.
Hummer H3 Base and Luxury package recommend 265 75 16. If you had the Adventure package or the Luxury package with the off-road option they came with 285 75 16. Those that came with the 285 75 16 tires had wheels with an offset of 39 mm. Otherwise the wheels had a 30 mm offset.
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